Arc welding generator



March 19, 1929. J. POLEK 1,705,646

ARC WELDING GENE-RATOR Filed June 15, 1927 /mvE/von .708.51%V POL EK Patented Mar. 19, 1929.

1 UNH-ED :STATES PATENT @FEiG-E.

yJosiarr'riroman, or BROOKLYN, NEW YORK.

IARC WELDIN'G GENERATOR.

Application med rune 13,

. a constant output at different speeds within reasonable limits. -j-The' generator to be described -and claimed "herein 4is. especially adapted for use in'a combination where the prime mover or driving source of energy is an' 'internal combustion engine, which .has .a speed .varying throughfwideflimits, depending upon the-position of-fthethrottle.

en4 aninternal.- combustion engine is used,- as 'the' prime' mover, I haveworked out Van arrangement by whic h,when the Welding 'operation-isnot going on, forwexample when a new electrode is being fitted to the electrode holder,. the throttle is automatically closed and the speed reduced, thereby saving fuel, but under such conditionsfthe generator is designed to deliver avoltage'considerably above .thewelding potential required, so that even t with the -reduced speedfof the generator, an

arc'rmay-be readily struck. A v.

I 'have-also provided. an arrangement'or control Vfor the engine, :such that when Athe arc is struck, the engine .throttle,is' automatically opened and the speedof the .generator is increased, thereby placing it'in condition to carry the 'maximum'loadf .This arrangement also, f provides quickly .adjustable means, whereby the output of the generator can he 'set to any desired value, dependingr on the class of welding work to be donc.

From what has been said, the objects of my invention will be readily understood and appreciated, pa rticularly after a raiding of the specification taken in connection with the annexed drawing, in which Figure; 1 is a diagrammatic arrangement Vshowing the engine` control mechanisln and the generator connected into an are welding circuit. Figure 2 is a diagram illustrating the construction of the generator.

In the drawing, the generator 1, comprises a field ring and an armature having brushes 2 and 3 of opposite polarity, as shown in Figure 1, it being understood that in practice, I may use, for example, four sets of brushes, such as shownV in Figure 2, or there may be a plurality of brushes arranged in parallel. The generator has two sets of fieldrpole pieces 30 and 31, the poles of each set being substantially the same, but the two sets being materially diferent in their construction. The

1927. Serial' No. 199,394.

pole pieces 31 carry a series winding 4, while the pole pieces 30 carry a. shunt winding 5, the terminals of the generator 32 and 33, are adapted to be connected to the welding electrodes 6 and in a manner similar to .that shown in Figure 1. It will be notedby reference .to Figure 2 that the periphery of the armature is designated by dotted line 34, and that the pole pieces 31 are tapering in 'form toward the armature, while the pole pieces v30 haveextended pole tips 36. The air gap between the poles 30.and their respective tips 36, and the armature is considerably less than the air gap 35,-betwe'en the pole pieces 31 and the armature. The purpose of this constructionwill be later referred to.

8 is a fragment portion of the intake mauifold of au interna. combustionengine. To the manifold -8 is connected the usual `Carburetor 9, and a throttle 1() is provided-for controlling the speed of the engine. Connected to the throttle 10 is a-lcver 11, and a nipple; 12, Ywhich isthreaded to receive a threaded end of the rod 13. Within the barrel 16 is carried a plunger 2O .attached to the end of the rod 13'. Solenoid 17 is carried by :the barrel 16 and is adapted to be connected in shunt across the brushes 1G, by the. wires 27 and 28 and around the rod 13 is a spring 21, 'while in theothcr end of the bari .l 16 is a spring preferably somewhat heavier than the springll. One end ofthe barrel 1G is threaded to reci a an adjusting screw 18, on which is carried a lock mit l). ',lhe screw 1S is internally1 threaded and carries a threaded adjusting member 23. haring a knob 24 for screwing (he member 2341 forward and hack in the carrier screw 1S. Asr-:m-iaed vwith the nwm'lzcr 223 is a collar 26 adapted to be engaged by the end of an indicating lever, the oppos` 'e end of which cooperates with the graduating scale to indicate the output of the generator.

Carried on the rod 13 is an adjusting collar 14 and :1 set screw 15, which limits the amount of movenlcnt of the throttle 10. It will be understood that a pair of lock nuts or the equivalent. may he used instead of thc collar 14 and the screw 15. By the adjust vnient of the collar 11i and the parts 18 and 23,

(he control of the engine throttle can he regulated wimin very close limits and when the 'welding operation ceases the voltage of the generator increases, allowing the solenoid to pull the plunger 20 inward to close the throttle, but when the arc is struck by the loo electrdet oittlie vdrk voltage ofA the generator is lowered and the spring@v overcomes the ei'ect of the solenoid 17, thereby opening the throttle, speeding tip' tlieleng'ine i5 poles; it-beng-a wellknown'fact'that afplain shun'tfield generator iinder load hasa drooping characteristic, and'it will be understood Iin the'presenticase that due tothe. largerair gap' under the-'poles '31,:throughravhich the :an flux from ,the 'shunt wound lpoles 30. travels, that a point is reachedl Wherebyf the'fluxill buil'dup no; farther andfno greater load-than that for which the system is'. set,-'c'a'n taken from the generator fitbeing'ndestoodrthat l5 the poles 30 and 31 act cumulatively and not differentially. i -L The arrangement-of the generator pole pieces and disl'nositionoffthe ivindings thereon is such as to givesubstantially constant 30 output for any 'given' setting, and at the same time, the construction is 'such that the'otput has a maximum limit so that the generator or thefp'rime move'rl cannot lie-unduly overloadediand therebyinjured;`

Vhil'e I have shown-no Held rheostat in circuit with 'thef'shunt field 5 'one of course,

'may be used ilfidesired. l

It will 'be' apparent' that my invention is susceptible of certain changes without dezo parting'from thespirit of'the'same.

Having-"thus described my ii'ive-nt'ion, what Iclaimis: 1

1. For an arc Welding system, a primo mover having-a throttle, a generator driven by said prime mover and having only a .single Winding on its armature which driven at vaiiablespeeds and deliveringr Cnrrent at variable voltages, an adjustable device separate from the generator but having a part so connected to Said throttle and having a part responsive to the voltage of the generator for predeterminin'g the output o1' the generator as desired according to the Welding work to be done, 'and means constituting inherent parts 'of the generator for delivering the predetermined output, said means comprising two sets-bt'pole pieces, alteiiiately arranged, a shunt winding on one set of pole pieces, a series winding on the other set of pole pieces, w one: seitof pole pieces having a greater air gap with inspect to the armatore, than the other set of pole pieces. l

2. For an i are Welding system, a prime Vmover having'a throttle, agenerator dri-ven 65 by said prime mover and having only .series wvinding'on the other set of pole pieces,

the set-of pole pieces carrying the series winding having a greater air gapwithgrespect :to

the armature than theother set-of pole. pieces.

3. For an are Welding sys-tem, va prime. mover' lia'ving a throttle, agenerator'clrlven -by ,said pri-me mover and having only a single winding on*v its 'a'n'iature vwhich 1s driven at variable speedsand delive-ringfcurrent at variable voltages,anadjustable device separate from the generator but having-a part connected to said throttlevand having a part responsive to the voltage-ofthe generator for predetermining the output of the'generator as desired according to the Welding wor-k to be done, and ineans constituting inherent parts of the generatori for delivering the pre- -determined .out-pnt, said means comprising -twosets o'f pol'e pieces alternately arranged,

shunt winding on one seto'f pole pieces, a4

`series* winding on the other set o'f p-ole=pieces,

oneJ setot pole pieces havingextended pole tips which are-closer tothearinature than the other set of pole-pieces. -v 4. F or an arc-Welding system, a prime mover having a throttle, a generator driven by said 'prime mover and having only a single winding on Iits varmature whichl is drivenat Variable speedsand deliveringr current at variable voltages, an adjustable device separate from the generator but having a part connected to said throttle and 'hav-ing a part responsive to the voltage of the generator. for predetermining the output of the generator as desired according to the'welding work to be done, and means constituting inherent parts of the generator 'for deliveringr the predetermined output, said means-comprising two sets of pole pieces alternately arranged, a shunt Winding on one setof pole pieces, a series Winding on the other sot of pole I iieces, the set of pole pieces carrying the shunt vWinding having extended pole tips 'which are closer to the armature than the pole pieces carrying the series Winding.

' 5. For an are Welding system, a prima mover having' a throttle, agenerator driven by said prime mover and having only a single winding on its armature whichV is driven "at variable speeds and delivering` current at variable voltages, an adj ustabledevice separate from the generator but having a part connected `to said1 throttle and-fhavingay part fresponsive to the' voltageof the generatorfor "predetermining the output oflthe' generator I a shunt winding on one'isetloi' ole: ieces :a

"series Windingon the other/set-of pole' pieces,

' one set'of pole pieces being tapered romthe field ring toward the' armaturefandh'avingia greater air: gap with respect' to `fthearmature 1- than the vpole pieces 'of the: other: setot :pole

pieces.

.-1'1.' y6. .For an arc iweldingusystexnplxa: prime Cil mover having a throttle, a generator driven byl said'` 'primed mover and having only a single winding on its armature which is driven at variable speeds and delivering current at variable voltages, an adjustable device sep a rate from the generator but having a part connected to said throttle and having a part responsive to the voltage of the generator for pi'edeterihining the output of the generator as desired according to the Welding Work to be done, and means constituting inherent parts of the generator for delivering the predetermined output, said means comprising two sets of pole pieces alternately arranged, a shunt winding on one set of pole pieces, a series Winding on the other set of pole pieces, the set of pole pieces carrying the series Winding being tapered from the field ring toward the armature and having a greater air gap with respect to the armature than the other set of pole pieces, which carry the shunt winding.

7. For an arc Welding system, a prime mover having a throttle, a generator driven by said prime mover and having only a single winding on its armature which is driven at variable speeds and delivering current at variable voltages, an adjustable device separate 'l rom the generator but having a part connected to said throttle and having a part responsive to the voltage of the generator for predetern'iining the output of the generator as desired according to the welding Work to be done, and means constituting inherent parts of the generator for delivering the predeterminedoutput, said means comprising two sets of pole pieces alternately arranged, a shunt winding on one set of pole pieces, a series Windiu on the other set of pole pieces, one set of pole pieces having extended pole tips and the other set being tapered from the field ring toward the armature.

8. For an arc Welding system, a prime mover having a throttle, a generator driven by said prime mover and havingl only a single winding on its armature which is driven at variable speeds and delivering current at variable voltages, an adjustable device separate from the generator but having a part i connected-tto-s'aid throttlefand yhaving a part l:responsive tothe voltage of the: generator -or 3 predeterminingthe output of vthe,.generator Las desired .according to vthe Welding-v lwork torfbe done, andmeans constituting1 inherent '.eiparts 'of the generator for deliveringthepreldetermined; i output,I .fsaid' means i 'comprising etwose'ts pf; .pole pieces :alternately arranged, has-shunt windingfonone schot-pole pieces-,1 a 'ws'erie's windiii'gfon theotherlset of pole pieces,

one set of pole pieces having extended'ipolc .ti'ps, theishnnt Winding beingarranged on ifthis estrofa-*pole pieces -the other set ofv pole pieces being; tapered from; the field i ring, to

'ilwindillgqgllid 'Si -t' are f9.- ,Egrnan i vare g -nveldlng system ya; -prnne movenhaving 'agthrottle,I generatorx driven by said prime mover and having only a single Winding on its armature which is driven at variable speeds and delivering current at variable voltages, an adjustable device separate from the generator but having a part connected to said throttle and having apart responsive to the voltage of the generator for predetermining the output of the generator as desired according to the Welding Work to be done, and means constituting inherent parts of the generator for delivering the predetermined output, said means comprising two sets of pole pieces alternately arranged, a shunt Winding on one set of pole pieces, a series winding on the other set of pole pieces, one set of pole pieces having extended pole tips, the shunt winding being arranged on this set of pole pieces the other set of pole pieces being tapered from the field ring toward the armature and carrying the series Winding, said last mentioned pole pieces having a greater air gap with respect to the armature than the pole pieces carrying the shunt Winding.

10. For an arc welding system, a prime mover having a throttle, a generator driven at a variable speed by said prime mover, a device including an energizing coil adapted to be connected across the generator brushes for setting the load which is desired to be taken from the generator, said device having a part connected to said throttle for determining the maximum speed at which the generator shall be driven, said generator having two sets of pole pieces alternately arranged, a shunt Winding on one seto pole pieces, a series winding on the other set of pole pieces, one set of pole pieces having an average greater cross-sectional area than the other .set as Well as a shorter armature air gap, said first mentioned set of pole pieces having extended pole tips and carrying the shunt winding, the series Winding being carried on the other set of pole pieces.

ll. For an arc Welding syst-em, a prime mover having a throttle, a generator driven by said prime mover, a device responsive to .-wardg the: armatureland; carrying the @series Y the voltage ftlle gneratr for m'ovingasaid to contrdlthe mtiverhent f the throttle,I said alternately arranged, a shunt Winding on one setrof pele pieces, av series winding on theV nther Set Ofvpole pieces, one set of pole pieces Y having -njaverage `greater Cross sectional; area 1 than the' --other set' zas .well 'as 'a' shorr A armature air gap-=rmover having-a tlro'ttle'fa generawrdriven tothe voltage o'f tfhegeneiawr; fer? movi-ng said throttle, said regulator being adjustable -to i'ridCate't-hecuhent output-of fthe 'gehera-tor and to '-cdtrylith'e movement-0fthe thmttle, r

said generatr having -two's'ets of 'pole pieces alternately arranged; a vs hunt winding on one set'ef pole;p1eces,a sei-les winding oi. the

:othersetdf pole pieees,o`r1e set-of pele pieces A'tapered from the field ring 'toward the armature and carryingthe series; winding', sandl histl mentioned; pole pieces haw/ mg :t

Y Y 5.: ,A f. `greater airgap withrespeet to the arumture 1 12; Furmnfar'e Ywelding system, a priihe :1

than thepoe'piecescarrying-the shunt Wind- 4 I .f'ingwhereby tllefgenerirtor will deliver the by said. prime mover; a.- regulter respensiye current'predterlrinedby the setting of the regulator.

=;-::1`I 1 testimdny whereof, I ailixany signature. 

